github.com/braveheart12/insolar-09-08-19@v0.8.7/platformpolicy/internal/sign/wrapper.go (about)

     1  /*
     2   *    Copyright 2019 Insolar Technologies
     3   *
     4   *    Licensed under the Apache License, Version 2.0 (the "License");
     5   *    you may not use this file except in compliance with the License.
     6   *    You may obtain a copy of the License at
     7   *
     8   *        http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   *    Unless required by applicable law or agreed to in writing, software
    11   *    distributed under the License is distributed on an "AS IS" BASIS,
    12   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   *    See the License for the specific language governing permissions and
    14   *    limitations under the License.
    15   */
    16  
    17  package sign
    18  
    19  import (
    20  	"crypto/ecdsa"
    21  	"crypto/rand"
    22  
    23  	"github.com/insolar/insolar/core"
    24  	"github.com/insolar/insolar/log"
    25  	"github.com/pkg/errors"
    26  )
    27  
    28  type ecdsaSignerWrapper struct {
    29  	privateKey *ecdsa.PrivateKey
    30  	hasher     core.Hasher
    31  }
    32  
    33  func (sw *ecdsaSignerWrapper) Sign(data []byte) (*core.Signature, error) {
    34  	hash := sw.hasher.Hash(data)
    35  
    36  	r, s, err := ecdsa.Sign(rand.Reader, sw.privateKey, hash)
    37  	if err != nil {
    38  		return nil, errors.Wrap(err, "[ Sign ] could't sign data")
    39  	}
    40  
    41  	ecdsaSignature := SerializeTwoBigInt(r, s)
    42  	if err != nil {
    43  		return nil, errors.Wrap(err, "[ Sign ] could't sign data")
    44  	}
    45  
    46  	signature := core.SignatureFromBytes(ecdsaSignature)
    47  	return &signature, nil
    48  }
    49  
    50  type ecdsaVerifyWrapper struct {
    51  	publicKey *ecdsa.PublicKey
    52  	hasher    core.Hasher
    53  }
    54  
    55  func (sw *ecdsaVerifyWrapper) Verify(signature core.Signature, data []byte) bool {
    56  	if signature.Bytes() == nil {
    57  		return false
    58  	}
    59  	r, s, err := DeserializeTwoBigInt(signature.Bytes())
    60  	if err != nil {
    61  		log.Error(err)
    62  		return false
    63  	}
    64  
    65  	hash := sw.hasher.Hash(data)
    66  	return ecdsa.Verify(sw.publicKey, hash, r, s)
    67  }